Learning Forum

[asustark700]

Hi there!

Hope you are also doing well!

 

i am trying to design and analyse a centrifugal impeller, according to my calculation... 

inlet blade angle is 30deg.

backsweep angle is 60deg.

 

But my question: How can i make blade with angles in bladegen only?

i tried a lot but i am unable to do so

Thanking you.

 

sending positive vibes!!!

cheap person

[rfblumen]

Given an inlet blade angle and a backsweep angle for a centrifugal impeller, the easiest way to implement these into BladeGen is the following (i'm assuming you're starting from the beginning):

-Open BladeGen.  Select File->New->BladeGen Model. Select "Radial Impeller".  Adjust the meridional (z,r) coordinates to reflect your design (or do this later).  Accept the initial angle/thickness values (this can be changed later)

-In quadrant 3 (i.e. Angle View), RMB inside the window and select "Beta Definition" from the pop-up menu.  The default curve type is spline.  It's easier to work with a Bezier curve definition, so RMB in the window again and select "Convert Points to"->"Bezier Control Points".  Hit "OK" on the Point Count Dialag pop-up window.

-Note that the beta angle definition is based on the axial direction by default (this can be changed to the tangential direction by going to Model->Ang/Thk Beta Definition).  Typically, the backsweep angle is based on the tangential direction, so an appropriate angle transformation will need to be made 

-In the Angle View, double click on the first Beta angle point and enter the inlet angle.  Double-click on the last Beta angle point and enter the angle representing the backsweep angle. 

Note that this has adjusted the beta angles for the hub layer.  The above steps will need to be repeated for all the active layers.  The intermediate beta Bezier curve points will then need to be adjusted to provide a consistent theta distribution (or "blade wrap angle") for all layers.